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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SJ5PEPF00000207.mail.protection.outlook.com (10.167.244.40) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9723.19 via Frontend Transport; Thu, 19 Mar 2026 01:15:33 +0000 Received: from ethanolx50f7host.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Wed, 18 Mar 2026 20:15:21 -0500 From: Smita Koralahalli To: , , , , CC: Ard Biesheuvel , Alison Schofield , Vishal Verma , "Ira Weiny" , Dan Williams , Jonathan Cameron , Yazen Ghannam , Dave Jiang , Davidlohr Bueso , Matthew Wilcox , Jan Kara , "Rafael J . Wysocki" , Len Brown , Pavel Machek , Li Ming , Jeff Johnson , "Ying Huang" , Yao Xingtao , Peter Zijlstra , Greg Kroah-Hartman , Nathan Fontenot , Terry Bowman , Robert Richter , Benjamin Cheatham , Zhijian Li , Borislav Petkov , Smita Koralahalli , Tomasz Wolski Subject: [PATCH v7 7/7] dax/hmem: Reintroduce Soft Reserved ranges back into the iomem tree Date: Thu, 19 Mar 2026 01:15:00 +0000 Message-ID: <20260319011500.241426-8-Smita.KoralahalliChannabasappa@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260319011500.241426-1-Smita.KoralahalliChannabasappa@amd.com> References: <20260319011500.241426-1-Smita.KoralahalliChannabasappa@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF00000207:EE_|BN5PR12MB9461:EE_ X-MS-Office365-Filtering-Correlation-Id: 7790d6db-84b6-4b55-752f-08de85550527 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|82310400026|376014|1800799024|36860700016|13003099007|56012099003|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(7416014)(82310400026)(376014)(1800799024)(36860700016)(13003099007)(56012099003)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: UOsXxiBAX9r+C8KdGaEswxh4kxXa2FsOwnVKFnbRw/1lVNEy21nBc0nVQkQg/+QgicHViG304roVJMmR1zHIo90Dv4jtL/MRJOrLuE056hmiO1KIehXirsq08ABHoJnRusdUakdFBmas4t3SsrQXFyvJRTxdkklQZkkKlqXxeMzgaqRxZk2jaA+AR/oGAZ/he+U1AheQy6sYevN+T1PL2eNJ7435H3c041OIQ7qvCMOi/4uMTm6RScZgjrWJysMamKAmMtIxYPyBvfNIqd1ol2iM38QMON7TTwLo1yBscshY0y6ySlswO1sJLpt2uAZWjdcltWvT9salMvVNLN+6iUrSBe9TKMiZShCOsweK2G5ONubYyZ+7TIknFMSMh6n4R0vurk+1Vs7EflZ6IyAiv/kViJ+lXTR0a/7FUaBA61IIjh/iLT7uE0kUHyyevDyb X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Mar 2026 01:15:33.7547 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7790d6db-84b6-4b55-752f-08de85550527 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF00000207.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN5PR12MB9461 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Reworked from a patch by Alison Schofield Reintroduce Soft Reserved range into the iomem_resource tree for HMEM to consume. This restores visibility in /proc/iomem for ranges actively in use, while avoiding the early-boot conflicts that occurred when Soft Reserved was published into iomem before CXL window and region discovery. Link: https://lore.kernel.org/linux-cxl/29312c0765224ae76862d59a17748c8188f= b95f1.1692638817.git.alison.schofield@intel.com/ Co-developed-by: Alison Schofield Signed-off-by: Alison Schofield Co-developed-by: Zhijian Li Signed-off-by: Zhijian Li Signed-off-by: Smita Koralahalli Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Reviewed-by: Dan Williams --- drivers/dax/hmem/hmem.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c index 8c574123bd3b..15e462589b92 100644 --- a/drivers/dax/hmem/hmem.c +++ b/drivers/dax/hmem/hmem.c @@ -72,6 +72,34 @@ void dax_hmem_flush_work(void) } EXPORT_SYMBOL_GPL(dax_hmem_flush_work); =20 +static void remove_soft_reserved(void *r) +{ + remove_resource(r); + kfree(r); +} + +static int add_soft_reserve_into_iomem(struct device *host, + const struct resource *res) +{ + int rc; + + struct resource *soft __free(kfree) =3D + kmalloc(sizeof(*res), GFP_KERNEL); + if (!soft) + return -ENOMEM; + + *soft =3D DEFINE_RES_NAMED_DESC(res->start, (res->end - res->start + 1), + "Soft Reserved", IORESOURCE_MEM, + IORES_DESC_SOFT_RESERVED); + + rc =3D insert_resource(&iomem_resource, soft); + if (rc) + return rc; + + return devm_add_action_or_reset(host, remove_soft_reserved, + no_free_ptr(soft)); +} + static int hmem_register_device(struct device *host, int target_nid, const struct resource *res) { @@ -94,7 +122,9 @@ static int hmem_register_device(struct device *host, int= target_nid, if (rc !=3D REGION_INTERSECTS) return 0; =20 - /* TODO: Add Soft-Reserved memory back to iomem */ + rc =3D add_soft_reserve_into_iomem(host, res); + if (rc) + return rc; =20 id =3D memregion_alloc(GFP_KERNEL); if (id < 0) { --=20 2.17.1